Hardness RC 30 max.Machine bushings are made of rugged carbon steel for maximum corrosion resistanceInstalled axially, these round shims are used to take up slack on shaftsTypical applications include industrial and farm machinery, electronic equipment and power transmission assembliesFinish: Zinc Industry Standard: ASTM F844 Inside Diameter: 1-3/4 Inch Inside Diameter Maximum: 1.775 Inch Inside Diameter Minimum: 1.760 Inch Item: Machine Bushing Material: Carbon Steel Measurement: Inch Origin: Imported Outside Diameter: 2-1/2 Inch Outside Diameter Maximum: 2.510 Inch Outside Diameter Minimum: 2.493 Inch Specification: ASTM F844 Thickness: 10 Gauge Thickness Maximum: 0.141 Inch Thickness Minimum: 0.127 Inch Type: Narrow Rim